-- Copyright (c) 2007 Maksym Motornyy <mmotorny@gmail.com>
--
-- Permission is hereby granted, free of charge, to any person obtaining a copy
-- of this software and associated documentation files (the "Software"), to deal
-- in the Software without restriction, including without limitation the rights
-- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-- copies of the Software, and to permit persons to whom the Software is
-- furnished to do so, subject to the following conditions:
--
-- The above copyright notice and this permission notice shall be included in
-- all copies or substantial portions of the Software.
--
-- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-- THE SOFTWARE.

module HPython.ParsecExtensions where

import Text.ParserCombinators.Parsec hiding (notFollowedBy)

-- TODO: get rid of this operator to improve speed and error positioning
(<#>) 
	:: GenParser token state returnValue 
	-> GenParser token state returnValue 
	-> GenParser token state returnValue
	
(<#>) _leftParser _rightParser = 
	try _leftParser <|> _rightParser
	
infixr 1 <#>

notFollowedBy :: (Show returnValue) => GenParser token state returnValue -> GenParser token state ()
notFollowedBy _parser =
	try $
		do
		{	do
			{	_input <- _parser
			;	unexpected $ show _input
			}
		<|>	return ()
		}

